Speed up TzS2PolygonsToTzS2CellUnionsTest am: cac51dcbbf am: 042cc25f20 am: 42f0276e0c am: 5afe5927a0

Original change: https://android-review.googlesource.com/c/platform/packages/modules/GeoTZ/+/2068288

Change-Id: I4fe584416a7d444b7425a28dbc07e73c611c7099
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>